Either an actual depiction of a sperm cell hitting an egg, or a scene where a woman is saying that she will become pregnant as a result of being cummed inside.
See also fertilization, and female fertilization for the female-only/sperm-free counterpart.
The following tags are aliased to this tag: impregnate (learn more).
The following tags implicate this tag: mutual_impregnation (learn more).
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